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Synthesis and rheological properties of polylactide/poly(ethylene glycol) multiblock copolymers

Abstract : Ring-opening polymerization of D,L-lactide was carried out in the presence of poly(ethylene glycol), using Zn powder as catalyst. The hydroxyl-capped PLA-PEG-PLA triblock copolymers were coupled with adipoyl chloride at different molar ratios under mild conditions. N-dimethylaminopyridine (DMAP) was used as catalyst of the coupling reaction. The resulting PLA/PEG multiblock copolymers were characterized by various analytical techniques such as IR, 1H NMR, SEC and DSC. Sol-gel transition properties of the multiblock copolymers were investigated by mechanical rheology. The data showed that the sol-gel transition temperature and the transition modulus increased with increasing molecular weight and the solution concentration of the multiblock copolymers.
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https://hal.archives-ouvertes.fr/hal-00417107
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Submitted on : Tuesday, September 15, 2009 - 1:13:32 PM
Last modification on : Thursday, October 14, 2021 - 12:28:09 PM

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Suming Li. Synthesis and rheological properties of polylactide/poly(ethylene glycol) multiblock copolymers. Macromolecular Bioscience, Wiley-VCH Verlag, 2005, 5, pp.1125-1131. ⟨10.1002/mabi.200500143⟩. ⟨hal-00417107⟩

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